The development and evaluation of a prototype grade severity rating system. Final report.

Federal Highway Administration, Washington, D.C.

Development of a prototype service-life indicator for organic vapor respirators /

Mode of access: Internet.

The Child development associate program : prototype model : CDA training provider improvement system /

"Contract number 105-78-1016."

A zero-relative-velocity belt skimmer, Stage II : Confirming tests and prototype design /

Final report, issued May 1977.